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Flying Start
The Flying Start feature is used to start an already rotating motor. When a drive is started in normal mode, it will apply a
frequency of 0 Hz to the motor and then ramp up to the desired frequency. If the motor is already rotating, the drive will try to
force the motor to stop, which will generate large currents, which will cause an overcurrent fault.
There are two options to be considered when using the Flying Start feature of the PowerFlex 755 series drive.
Enhanced
Sweep
Use the steps below to configure the drive to allow the motor shaft to continue turning without power, then explore the different
options for Flying Start.
Configuring the Drive Parameters for Flying Start
The steps below will configure the drive to coast to a stop, configure a switch to determine Forward and Reverse Direction,
modify the Motor Control Mode, and modify the data displayed on the HIM module to easily view the changing frequency of the
drive.
1. Select the Parameters button to view the parameters for the PowerFlex 755 drive.
2. Using the Group drop down list, expand Drive Cfg and select Braking Features.
3. Click the field for Stop Mode A, and select Coast.
4. Using the Group drop down list, expand Feedback & I/O, and select Digin Functions.
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